Spin-Stretching Modes in Anisotropic Magnets: Spin-Wave Excitations in the MultiferroicBa2CoGe2O7
Citations Over TimeTop 10% of 2012 papers
Abstract
We studied spin excitations in the magnetically ordered phase of the noncentrosymmetric Ba(2)CoGe(2)O(7) in high magnetic fields up to 33 T. In the electron spin resonance and far infrared absorption spectra we found several spin excitations beyond the two conventional magnon modes expected for such a two-sublattice antiferromagnet. We show that a multiboson spin-wave theory describes these unconventional modes, including spin-stretching modes, characterized by an oscillating magnetic dipole and quadrupole moment. The lack of inversion symmetry allows each mode to become electric dipole active. We expect that the spin-stretching modes can be generally observed in inelastic neutron scattering and light absorption experiments in a broad class of ordered S > 1/2 spin systems with strong single-ion anisotropy and/or noncentrosymmetric lattice structure.
Related Papers
- → New Material Exploration to Enhance Neutron Intensity below Cold Neutrons: Nanosized Graphene Flower Aggregation(2022)11 cited
- → Polarized neutrons for pulsed neutron sources(2005)7 cited
- → Measurement of the spin-wave specific heat of antiferromagnetic CoCl26H2O and NiCl26H2O(1965)12 cited
- → Neutron scattering study of antiferromagnetic ordering in YBa2Cu3Ox(1989)9 cited
- → Neutron inelastic scattering from molecular liquids and glasses(1993)1 cited